CR Scientific: Catalog: Porcelain spot plate / streak plate & Plastic spot plates

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Spot Plates for Qualitative Analysis

#1875. Re-usable or disposable white plastic spot plates with 12 wells - great for qualitative analysis of crushed or dissolved mineral samples. Can be considered disposable. Acid- and alkali-resistant. Will be attacked by organic solvents such as acetone, xylene, methylene chloride, etc; however, this item is popular for drug testing and seems to withstand brief exposure to CHCl₃, at least enough to develop the test results.
Provides a white background against which delicate colors will show up for various tests.
Dimensions: 8 x 10.9 cm.
The wells are approx 21.5 mm diameter and roughly 11.5 mm deep.
1 dozen color plates per package.

Price: $8.49 per pack of 12
Weight: approx. 0.3 lb. per pack.
1-10 packs: $8.49 ea; 11-20 packs: $8.19 ea; 21+ packs: $7.59 ea.
further discounts available for 100+ quantity.

#1876. Porcelain Spot Plates - Glazed, White - 6 cavities- Reusable - great for qualitative chemical analysis of crushed or dissolved mineral samples, especially when organic solvents such as acetone must be used. Glazed porcelain wells are resistant to most acids and reagents (except HF)*. The white background helps visualize any colors that may form during diagnostic tests.

The back of these are unglazed. That means this item can double as a mineral streak plate - very useful. This item is small enough that it can be carried around in a field test kit. It measures 5.5 x 8.5 cm. Thickness is about 1.3 cm.

The wells are approximately 20 mm diameter by 6 mm deep.

Shipping Weight: approx. 0.4 lb. ea.
Price: $2.99 ea.
3-6 pcs: $2.79 ea; 7-10 pcs: $2.49 ea; 11+ pcs: $2.19 ea.
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#1877. Porcelain Spot Plate, Glazed, White, 12 cavities. Similar to 1876 but twice the number of wells. Size is about 9 x 11.5 cm. Back is unglazed.
Ship. wt. approx. 0.9 lb ea.
Price $4.89 ea.
3-6 pcs: $4.59 ea; 7-10 pcs: $4.49 ea; 11+ pcs: $4.39 ea.

* Permanganates and certain other reagents can leave stubborn stains in the semi-porous porcelain surface if they are left in contact with it for too long.

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